When sound waves interfere to create standing waves, the points on the medium that move up and down with the largest amplitudes are called

antinodes.

A standing wave is created when two waves in a medium interfere in such a way that certain points along the medium appear to stand still.

Indeed, the points at which the interference between the two waves is completely destructive show no displacement. These points are called nodes.

There are also points at which the interference between the two waves is completely constructive and these points appear to vibrate from a large positive position to a large negative position and back. These points are called antinodes.